【答案解析】

With the development of economy and society ,people need much more information and communication. So more and more people surf on Internet. Internet plays an important role in our lives, Although it has positive effects .there ate some negative ones too.
The positive effects can be demonstrated as fellows. For a start, from Internet, we can obtain much beneficial information and communicate with others conveniently. This, in turn, helps improve our working efficiency and promotes the economical prosperity of our country. What's more, from it, we can study and entertain ourselves. In addition, Internet also brings friendship between individuals, and even between countries, In contrast, Internet also gives rime to a aerie, of negative effects am well. For example, some contents on Internet are violent and dirty, which will corrode some people’s soul. Furthermore, the long chatting on Internet will hinder people' a study and rest.
The influence of Internet is actually a double-edged sword. We should try to make the most of its advantages. At the same time, we should avoid its harmfulness.